Abstract
Sensitivity encoding in two spatial dimensions (2D SENSE) with a receiver coil array is discussed as a means of improving the encoding efficiency of three-dimensional (3D) Fourier MRI. it is shown that in Fourier imaging with two phase encoding directions, 2D SENSE has key advantages over one-dimensional parallel imaging approaches. By exploiting two dimensions for hybrid encoding, the conditioning of the reconstruction problem can be considerably improved, resulting in superior signal-to-noise behavior. As a consequence, 2D SENSE permits greater scan time reduction, which particularly benefits the inherently time-consuming 3D techniques.
Along with the principles of 2D SENSE imaging, the properties of the technique are discussed and investigated by means of simulations. Special attention is given to the role of the coil configuration, yielding practical setups with four and six coils. The in vivo feasibility of the two-dimensional approach is demonstrated for 3D head imaging, permitting four-fold scan time reduction.
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References
Hutchinson M. Raff U. Fast MRI data acquisition using multiple detectors. Magn Reson Med 1988:6:87–91.
Kelton JR, Magin RL, Wright SM. An algorithm for rapid image acquisition using multiple receiver coils. Proceedings of the SMRM. 8th Annual Meeting, Amsterdam. 1989. p. 1172.
Ra JB, Rim CY. Fast imaging using subencoding data sets from multiple detectors. Magn Reson Med 1993;30:142–5.
Sodickson DK, Manning WJ. Simultaneous acquisition of spatial harmonics (SMASH): ultra-fast imaging with radiofrequency coil arrays. Magn Reson Med 1997:38:591–603.
Pruessmann KP. Weiger M, Scheidegger MB. Boesiger P. SENSE: sensitivity encoding for fast MRI. Magn Reson Med 1999:42:952–62.
Kyriakos WE. Panych LP, Kacher DF, Westin C-F. Bao SM. Mulkern RV. et al. Sensitivity profiles from an array of coils for encoding and reconstruction in parallel (SPACE RIP). Magn Reson Med 2000:44:301–8.
Griswold MA. Jakob PM. Nittka M, Goldfarb JW, Haase A. Partially parallel imaging with localized sensitivities (PILS). Magn Reson Med 2000:44:602–9.
Weiger M, Pruessmann KP, Boesiger P. Cardiac real-time imaging using SENSE. Magn Reson Med 2000:43:177–84.
Pruessmann KP. Weiger M, Boesiger P. Sensitivity encoded cardiac MRI. J Cardiovasc Magn Reson 2001:3:1–9.
Weiger M, Pruessmann KP, Kassner A, Roditi G, Lawton T, Reid A, et al. Contrast-enhanced 3D MRA using SENSE. J Magn Reson Imaging 2000:12:671–7.
Golay X. Pruessmann KP, Weiger M, Crelier GR. Folkers PM, Kollias SS. et al. PRESTO-SENSE: an ultra-fast whole brain fMRI technique. Magn Reson Med 2000:43:779–86.
Weiger M, Pruessmann KP, Leussler C, Roeschmann P, Boesiger P. Specific coil design for SENSE: a six-element cardiac array. Magn Reson Med 2001:45:495–504.
Roemer PB, Edelstein WA, Hayes CE, Souza SP, Mueller OM. The NMR phased array. Magn Reson Med 1990; 16:192–225.
Wang J, Reykowski A, Dickas J. Calculation of the signal-to-noise-ratio for simple surface coils and arrays of coils. IEEE Trans Biomed Eng 1995:42:908–17.
Weiger M, Pruessmann KP, Hilfiker PR, Weishaupt D, Boesiger P. Increasing the SNR in steady-state imaging by sensitivity encoding. Proceedings of the ISMRM, 8th Annual Meeting, Glasgow. 2001. p. 1798.
Dydak U, Weiger M, Pruessmann KP, Meier D, Boesiger P. Sensitivity-encoded spectroscopic imaging. Magn Reson Med 2001;46:713–22.
Larkman DJ, Hajnal JV, Herlihy AH, Coutts GA, Young IR, Ehnholm G. Use of multi-coil arrays for separation of signal from multiple slices simultaneously excited. J Magn Reson Imaging 2001;l3:313–7.
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Weiger, M., Pruessmann, K.P. & Boesiger, P. 2D sense for faster 3D MRI. MAGMA 14, 10–19 (2002). https://doi.org/10.1007/BF02668182
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DOI: https://doi.org/10.1007/BF02668182